Re: applying coupon discount AFTER global discounts
It's would be a violation because any type of discounts applying to product price at the same time, not to subtotal.
The most simple desicion without violation would be using discounts coupon with 9% not 10%. (i.e. you should decrese discount of coupons with percents of global discounts)
SUBTOTAL: 300.00
Discount: 30.00 (10%)
Discount Coupon: 27.00 (9%)
DISCOUNTED SUBTOTAL: 243.00
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